pgsql: Use clearer notation for getnameinfo() return handling

Use clearer notation for getnameinfo() return handling

Writing

    if (getnameinfo(...))
        handle_error();

reads quite strangely, so use something like

    if (getnameinfo(...) != 0)
        handle_error();

instead.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/f4a9da0a150ead846be33c38f665f4337a81054e

Modified Files
--------------
src/backend/libpq/hba.c             |    2 +-
src/backend/postmaster/postmaster.c |    4 ++--
src/backend/utils/adt/network.c     |    8 ++++----
src/backend/utils/adt/pgstatfuncs.c |   18 +++++++++---------
4 files changed, 16 insertions(+), 16 deletions(-)